Bump chisel3 from `b29731bd` to `8dca8564` (#143)

Bumps [chisel3](https://github.com/freechipsproject/chisel3) from `b29731bd` to `8dca8564`.
- [Release notes](https://github.com/freechipsproject/chisel3/releases)
- [Commits](https://github.com/freechipsproject/chisel3/compare/b29731bdd99d65e189cc676ac1dec2bcddd72621...8dca8564d8a1b86deea19059398fc2221a07a845

)

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